In 1991, five elementary school students went missing, leading to accusations of police mishandling. Their case remains unsolved to this day.

2) The frog boys disappearance: A 34-year mystery in South Korea mentioned in When Life Gives You Tangerines On March 26, 1991, five boys—Cheol-won, Chan-in, Ho-yeon, Jong-sik, and Yeong-gyu ...